Updating a previous report, Chicago Cubs RHP Jake Arrieta (hamstring) had an MRI Tuesday, Sept. 5, that revealed a Grade I strain in his hamstring. He's expected to be out 7-10 days and miss one or two starts. LHP Mike Montgomery is set to start in Arrieta's place Saturday, Sept. 9.

Chicago Cubs RHP Jake Arrieta (hamstring) underwent an MRI on his right hamstring Tuesday, Sept. 5, and is expected to get skipped in the rotation regardless of what results of the scan are, according to manager Joe Maddon.